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Trend Analysis for Atmospheric Hydrocarbon Partitioning Using Continuous Thermodynamics

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  • 1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California
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Abstract

The partitioning of atmospheric hydrocarbons into vapor and condensed phases when the species count is large is considered using the formalism of continuous thermodynamics. The vapor saturation pressures and condensate species distribution are parameterized using the species normal boiling temperatures. Qualitative trends in activity coefficient values and phase equilibrium behavior that are relevant to the outer planets and Titan are discussed in terms of a much simplified perspective on these aspects of partitioning. The trends found are generally consistent with those from other published atmospheric model results.

Corresponding author address: Dr. Kenneth Harstad, Jet Propulsion Laboratory, California Institute of Technology, M/S 125-109, 4800 Oak Grove Dr., Pasadena, CA 91109-8099. Email: Kenneth.G.Harstad@jpl.nasa.gov

Abstract

The partitioning of atmospheric hydrocarbons into vapor and condensed phases when the species count is large is considered using the formalism of continuous thermodynamics. The vapor saturation pressures and condensate species distribution are parameterized using the species normal boiling temperatures. Qualitative trends in activity coefficient values and phase equilibrium behavior that are relevant to the outer planets and Titan are discussed in terms of a much simplified perspective on these aspects of partitioning. The trends found are generally consistent with those from other published atmospheric model results.

Corresponding author address: Dr. Kenneth Harstad, Jet Propulsion Laboratory, California Institute of Technology, M/S 125-109, 4800 Oak Grove Dr., Pasadena, CA 91109-8099. Email: Kenneth.G.Harstad@jpl.nasa.gov

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